To help producing comment in source, use GhostDoc : http://www.roland-weigelt.de/ghostdoc/ .
GhostDoc description from Ghostdoc : GhostDoc is a free add-in for Visual Studio that automatically generates XML documentation comments. Either by using existing documentation inherited from base classes or implemented interfaces, or by deducing comments from name and type of e.g. methods, properties or parameters.

Next, you must produce documentation files…you can use NDoc for Visual Studio 2005 : http://jonas.lagerblad.com/blog/?p=4